Google has confirmed that it has acquired DeepMind, an artifical intelligence firm from London, but has declined to comment on the amount paid for the purchase.

DeepMind is a company based out of London specializing in machine learning and system neuroscience with backing from numerous investors including Founders Fund, Horizons Ventures and the developer of Skype and Kazaa, Jaan Tallinn.

According to re/code, the deal is estimated to be worth $400 million but Google has not revealed the details in its confirmation to the site.